Insulating-joint.



L. MQGARTHY. INSULATING JOINT.

APPLICATION FILED JAN. 13, 1912.

1,042,019. l 1 Patented 0ct;22,1|912.

L UNITED STATES PATENT OFFICE.

- maurienne-MINT.

To all wbomit may concern: i

Be it known that I, LoUIs MCCARTHY, a

citizen of the United States, residing at j',

erence being had therein to the accompanyfv ing drawings. f v

My invention has for lits object an improvementin insulating joints such` as are employed to connect rods or pipeamechani cally and. at the same time 'to insulate themv electrically fromeach other.

In an application filed by me January 5, 1912, Serial No. 669,583, I have shown and described an insulating joint of thistype, which has a *ting inthisspa'ce between" the edge' of the.v "member mater'all increased. l y

great increase in torsional strength over` joints as previously constructed. This joint is composed Aessentially of a pair of polygonal members held together by a steel 'shell having the same'polygonal form, thesides- 'of theV end members being parallel with the:`

sides of the shell and there beingl interposed between the shell and the end members and vbetween `theroximate faces of the end members lsuitab constructed in this manner have a very great increase in torsional strength and are there-jV fore' especially adapted to use wherethey are likely to receive such strains. This joint has a veryhigh resistance to electricity, but` scribed in this application, its'particular object being to preventl the current jum 'Iig from the yend. member tol the shell as a ove described, and at the` same timefto increase ,the mechanical strengthvof the joint. This is accomplishedl by providing a supplemen.-

.tary shell about the' inner shellV and by fillsupplementary shell andthe en I with insulating material so that the space to be jumpedis wider. This also has thel effect of preventing moisture `from settling in the crevices `in the insulationv adjacent and aboutthe end member. Inathis mann ner the electrical resistance offthe jqijnt vis The mvention will be .understood by reference to" the following specification,

Specification of `Letters Iatent. Application ned January 1a, 1912. .serial no. einem.i

1e insulating mat-erin .which is under compression from the shell.. Joints- Patented Oct. 22,1912.

' takeninconnection with the accompanyingJ drawmgs, and the novel features thereof are pointedGg outfand distinctly dened in the claimsy at the close of this specification.

Referringjto the drawings, vliigure l is an elevation off a hexagonal joint embodyin the invention. 2 is a top plan vview o the'joint shown in Fig. 1. Fig. 3 is a vertical section thereof. Fig. 4 is a section on line 4 4 Fig. 3.

At A and B are indicated -two end members which are polygonal in form. In the drawings the polygon chosen for the insulator is ahexagon. Two end members A and B are separated from each otherl by an interposed layer bf insulating materlal C and are surrounded and held together by a polygonal shell D, the ends of which are in-V cated a layer ofjinsulation E, which is of a material capable ofrbeing formed into a tube of polygonal cross section and after the'parts have been assembled of being shaped by the made in the vform of any desired polygon.

About/the .shell D, I place a secondv vshell 1F which lfor 'convenience I call the supple-l mentary shell. @aid supplementary shell F- is vof the same polygonal form as the `other j members' of thevjoint and is of a size to fit closely over the shelll D. Its ends are then curing theshell Fin place. The edge of the vsupplementary shell is as far as possible fromthe exposed metal of the adjacent end member so as tov increase the gap whlch the A or B, as the case-,may be, is filled invwith a4 suitable plastic insulating v vmaternal 'G `pressure to which the shellDKis subjected .y to turn in the ends dof the shell. The foregoing parts are all las described in my prior application and as therein stated may bel inturned lslightly as shown at f, thereby sej lcurrent I'nust jump to the largest possible ex# I .tentifThje space lbet-weenfthe edge of the4 supplementary shell E and thev end member f which"'is*capable of beingmolded such for instance as mica andv shellac compound.

Said insulation overlies 'and coversthe edge of the rstshell and the-edge of the primary insulation and for convenience may v be termed the vsupplementary` insulation. This l insulation is given a ysuitable exterior-t conn tour, asfshownin `Fig. 3, so that theres'hall f` be no projections." 1 l 4 The` .completed insulator constructed as 4described, will beseen to have a Wrench- 'receiving portion on its body, which is made of a double thickness of metal and is therefore very strong and capable of withstanding a heavy turning strain Without disturbing the relation ofthe parts. The gap i roduced by the supplementary insulation j is a Wide onef and this `insulation prevents lmoisture lodging around the end members.

vsupplementary layer of insulation occupyu ing the space between'the edge of the supplementary shell and the end members2 and overlying the edge of the'irst mentioned shell. f

2. The combination with a flanged end member having a polygonal form, of a shell surrounding the flanged end portion of the said end member, said shell having the same pol gonal form, a layerxof insulation separating the said shell from the end member,

mentioned shell, said supplementary shell also having the same polygonal form, and a supplementary layer of insulationgoceupying the space between the edge ofthe supplementary shell and the end members, and

overlying the edge of the rst mentioned shell.

` ln testimony whereof I affix my signature,

in presence of. t-Wo Witnesses.- Y

LOUIS MCCARTHY.

Witnesses:

J. ETHEL SCALLAN, GARDNER W. PizoUTY.

a supplementary yshell about the said first s 

